Optimal Impedance Calculation with a Two-Measurement MPPT Algorithm for Piezoelectric Vibration Harvesters
- Resource Type
- Conference
- Authors
- Decroix, Nicolas; Gasnier, Pierre; Morel, Adrien; Gibus, David; Badel, Adrien
- Source
- 2022 21st International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS) Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS), 2022 21st International Conference on. :62-65 Dec, 2022
- Subject
- Photonics and Electrooptics
Power, Energy and Industry Applications
Maximum power point trackers
Vibrations
Voltage measurement
Power measurement
Emulation
Resonant frequency
Programming
Maximum Power Point Tracking Algorithm
Piezoelectric Energy Harvesting
Microcontroller
Power Management Circuit
- Language
This paper proposes a novel Maximum Power Point Tracking (MPPT) architecture for weakly and highly coupled vibration piezoelectric harvesters. At a given input frequency, the microcontroller-based architecture allows to calculate the optimal impedance by means of voltage and phase measurements. It implements the full-bridge load adaptation technique with a flyback converter, which generates the appropriate optimal resistive load right after the impedance calculation. We proposed a dedicated test-bench with a highly coupled piezoelectric harvester $\left. {\left( {k_m^2 = } \right.4.7{\text{ }}\% } \right)$ to prove and validate the operation of the system. The optimal load was found on the useful frequency range (23.7 Hz - 26 Hz) around the harvester’s resonant frequency (f sc = 24.6 Hz). The system reached more than 90% of the maximum harvestable power (P max = 193 μW@0.2 m/s 2 ). We also proved that the proposed architecture is low power thanks to a low-level programming of the microcontroller: the STM32L4 consumes around 22 μW@1.8 V during the emulation of the optimal resistive load.